Need Help With Rear Spring Selection

Hi,

I'm new here. I have a 2001 330ci 5 speed convertible with the sport suspension. My rear springs are broken, and I'm having difficulty determining verifying and finding the correct springs for my car. The part suppliers I have found only list non-sport suspension springs, although some list heavy duty springs. Are these HD springs the sport suspension springs? This is my DD and I just want to replace them with original equipment springs, but looking for an alternative to the high priced OE springs.

Any help would be appreciated!

Thanks,

Jim